2003

3.7

1996

5.5

2013

7.6

1993

7.7

1994

7.5

1959

7.3

1985

6.2

0.0

2014

3.5

2007

6.6

1947

5.7

2009

5.4

1968

7.4

2006

5.7

2006

7.2

2009

5.7

2009

7.2

1953

6.8

1997

6.5

1938

4.8